Trussed structure



July 7, 1925.

G. H. DAWSON ET AL TRUSSBD STRUCTURE Original Filed Nov. 26, 1923 muentow Gearge [fives Dawson Humcihal Field Freas V Ma ma Patented July 7, 1925.

UNITED STATES GEORGE HIVES DAWSON,'

v 1,545,237 PATENT OFFICE.

OF BOSTON, MASSACHUSETTS, AND HURXTHAL FIELIi FBEASE, OF CANTON, OHIO.

TRUSSED STRUCTURE.

Original application filed November 26, 1923, Serial No. 676,897. Divided and this application filed December 12, 1924. Serial No. 755,401. 1

T all whom it may concern:

Be it known that we, GEORGE lllVES Daw- HON and I-IURXTUAL FIELD F REASE, citizens of the United States, residing, respectively, 5 at Boston, in the county of Suffolk and State of Massachusetts, and at Canton, in thecounty of Stark and State of Ohio, have invented new and useful Improvements'in Trussed Structures, of which the following ,is a specification. 1

The invention relates to trussed structures having spaced chord men'ibers and connecting web members joined together;

and this application is a division of our prior application for patent for trussed structures, filed November 26, 1923, Serial No. 676,897.

Ordinarily the chord and web members of a trussed structure are separate 'pieces which must be madeto size and assembled to form' the completed structure. In the manufacture of even a simple trussed girder of substantial'length, while the equivalent of a'large number of chord members is attained by the use of tumor more strips of the total length of the girder, yet there are still a large number of separate web members each of whichmust be anade and punched to size and each of which must be properly assembled and fastened usually by means of rivets .to the continuous equivalents of a large number of eliord'members. In the manufacture of such a girder 'the number of separate members each of which-must be made to size and assembled thereof, vthe number of chances. for manu- "facturing and assembling errors, for two- "the factthat it "has been found to be a p i'ac-' tieal impossibility accurately to. spa'ceand secure the fasteningimeansi-Which tie the truss member's togetherat the joints.- The objects of the"present invention are to economize the manufacture: of",t1wnssed structures and to overcome unequal-strains and stresses due to'yereet-ro'n inaccuraclespby' reducing the number of parts:to be .made

v often runs to several hundred. Dueto the fact that most of these members must be' fastened at each end to the co-0perating ..members in the structure or theequivalents structure unequal strains and stresses .are "Often. set up in individual members due -t0 and assembled; and these objects are attained by the use ofv Trussed elements formed from single continuous strips, and including spaced rows of chord members and col'inecting web members, and overlapped and opposed junction angles between the chord and web members.

The invention is illustrated in the accompanying drawing forming part hereof, in which Figure 1 is a fragmentary elevation of a trussed element having overla1.)ped junction angles;

Fig. 2, a fragmentary elevation of a trussed element having overlapped and abntted junction angles; and

Fig. 3, a top plan view of the same.

Similar numerals refer to similar parts throughout the drawing.

lVhile. the continuous material used to form the trussed elements may be of anv desired substance; for most practical pufposes a continuous metallic material adapts itself easily to the necessary forming operations, and to assembly by the use of any de sired fastening means such as riveting, welding, or mechanical means. 4

Referring to F ig. 1, a trussed element 20, .includes alternating chord members 21 and web members 22 formed from a continu-' ous rod 25 and having junction angles 24; between thechord and web members. The junction angles are overlapped as shown to form the pluraljoints 26 ,.which are adapted forfastening, as by means of the spotwelds 27 and the joints constitute themselves small triangular truss bays which not only strengthen the whole structure but also provide convenient points for wiring or otherwise fastening other material to the chord members. A -Referring to Figs. 2 and 3, a modified trussed element 20 includes alternating chord members 21 and Web members 92 formed from a C(llltlllllOllS .rod 25 and havingjunction angles 2& between the chord and web members. The junction an-' 'gles are.overlapped andabut each other as 'at-26 ,,andiare adapted to be fastened to the gside by side chord members as by means of spot welding not shown, and thus provide a trusse'cl. element made from a. continuous strip and having chord members Whose cross sectional area is a' multiple, of the area" of any web member. 1

The trussed elements of the present invention may themselves be used as load carrying members, or may be combined in any desired manner as component parts of more lastening the truss members together.

2. A trussed element formedfrom a continuous strip and including spaced rows of chord members and connecting .Web members, and opposed junction angles between thechord and Web members, the opposed angles overlapping and abutting each other,

and there being-means fastening the truss members together.

3. An element for making a'truss from a continuous strip, sald elementincludmg spaced rows "of chord members and connecting Web members, and opposed unctlon angles between the chord and Webmembers, all

formed in a continuous strip, and the opposed angles being overlapped.

, 4. An element for making-a truss from a continuous strip, said element including spaced rows of chord members and connecting web members, and opposed junction angles between the chord and Web members,

' all formed in a continuous strip, .and the 0p- ,crosssectional area of the strip.

posed angles overlapping and abutting each other;

5. An'element for making a truss from a continuous strip, said element including spaced rows of chord members and connecting web members, and opposed junction angles between the chord and web members, all formed in a continuous strip, and the chord members abutting each other, and constituting a truss chord having ,a crosssection'al area which is a' multiple of the 6. An element for making a truss continuous strlp, said element mcluding spaced rows of chord members and connect ing Web members, and opposed junction angles between the chord and Web members,

all formed in acontinuous strip, and the opposed angles overlapping each other and forming triangles.

7. A trussed element formed from a con tinuous strip, and including spaced rowsof chord members and connecting Web members, and opposed junction a'ngles between the chord and Web members, the opposed angles overlapplng each other and forming tr1- angles, and there being means fastenmg the truss memberstogether at the apexes of the triangles.

from a ill In testlmony that We claim the above, We v have hereunto subscribed our names.

GEORGE HIVES DAWSON. HURXTHAL FIELD FREASE. 

